Researchers find evidence of ancient solar storm in tree rings

Researchers from the University of Arizona have found evidence of a significant solar storm, known as a Miyake Event, that occurred around 664-663 BCE. This was determined by analyzing radiocarbon spikes in ancient tree rings. Miyake Events are rare occurrences marked by sharp increases in radiocarbon isotopes. This recent discovery adds to the six confirmed events in the last 14,500 years, providing insights into past solar activity. The study also compared tree-ring data with beryllium-10 isotopes in polar ice cores to confirm the timing of the event. Such solar storms could pose risks to modern technology, including satellites and power grids.